Tool-holder



HNTTED sTATEs PATENT oEEicE.

DEXTER H. GHAMBERLAIN, oE BOSTON, MASSACHUSETTS.4r

TOOL-HOLDER.

Specification of Letters Patent No. 10,500, dated February 7, 1854.

To all whom, it may concern.'

Be it known that I, DEXTER H. CHAMBER- LAIN, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Awl- Hafts or Tool-Holders; and I do herebyl declare that the same is fully described and represented in the following specication and the accompanying drawings, letters,

figures, and references thereof.

a chamber, c, formed in it as represented more particularly in Fig. 3, the female screw of Said nut being shown at 71. as disposed above the chamber, c. The lower part of the chamber, c, is made dome shaped or is provided with a conical or other proper shapedrecess, z', and a-hole or passage, k, leading outV of the middle there of. The chamber, c, isv calculated to re-v ceive two holding jaws, a, b, one of which is represented in bottom View in Fig. 4, in edge view in Fig. 5, in side view in Fig. 6, and also in Fig. 7 which denotes a view of its inner side. Each of the jaws is beveled or chamfered off at top and bottom (as seen at t, m) so as to correspond with the closing sockets of the screw and screw nut and so that when said screw nut is screwed down upon said jaws so as to clamp them between the sockets the jaws shall be forced toward one another and upon the awl or article placed between them and hold it firmly not only at or near the tops of both of the jaws, but also at or near their bottoms and also between said tops and bottoms.

The common split socket of awl hafts generally bears unequally and at the lower end of the awl, whereas by my improved manner of forcing the jaws together by means of the concave sockets of the screw v and nut, the jaws are caused to adapt them.

selves and to bear upon the entire length of that part ofthe shank interposed between them and so as to take a very firm and strong grasp upon it. The socket, g, also constitutes a rest or support for the upper end of the tool under endwise or longitudinal pressure on its-such being another advantage peculiar to my improvement.

Besides the advantages which my improved awl haft has over many others in firmly holding an awl or tool inserted between its jaws and supporting the lower end of the shank as described, it' is so made that any wrench such as is generally used to x close the jawsof the common awl haft is rendered unnecessary, as the screw nut is provided with a milled surface or edge (as turned on its screw. Thus when the screw 'nut-is firmly screwed down upon the jaws,

there lcan be no transverse revolution of the tool while in use, 'such as would be liable were the socket, g, and the lower'ends, a, b, made conical or spherical or so that the jaws a, o," could readily turn around in the socket g.

yI do not claim a split or jaw socket having a screw and screw nut applied to it for theV closing its jaws upon the shank of an awl or tool inserted between them, but

What I do claim as my invention is My improved method of arranging, constructing, andapplying together the jaws and confining screws, the same consisting in making the jaws, a, Y), separate from the screw shank e, (on which the screw f is cut) and in other respects substantially as described, and not only providing the screw nut with a closing concavity. or socket i, but the screw shank, e, with a closing socket, g,

for the jaws t0 rest in; the whole being s0 my signature this sixth day of January, that wen. the lrew sdscrwed cilovln A. D. 1854. upon t e Jaws e com me a0 lon o e jaws and the screw-nut shall operate to DEXTER H CHAMBERLAIN 5 simultaneously close the jaws Vather upperV Witnesses:

and lower ends as speced. R. H. EDDY,

In testimony whereof I have hereunto set F. P. HALE, J 1'. 

